85569089 has 2 divisors, whose sum is σ = 85569090. Its totient is φ = 85569088.

The previous prime is 85569079. The next prime is 85569149. The reversal of 85569089 is 98096558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84916225 + 652864 = 9215^2 + 808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85569089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85569079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42784544 + 42784545.

It is an arithmetic number, because the mean of its divisors is an integer number (42784545).

Almost surely, 2^85569089 is an apocalyptic number.

It is an amenable number.

85569089 is a deficient number, since it is larger than the sum of its proper divisors (1).

85569089 is an equidigital number, since it uses as much as digits as its factorization.

85569089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 50.

The square root of 85569089 is about 9250.3561553056. The cubic root of 85569089 is about 440.6620354096.

The spelling of 85569089 in words is "eighty-five million, five hundred sixty-nine thousand, eighty-nine".